Merge pull request #6072 from TrevorDev/oculusGoPadChangedObs

correct observable name to get pad press/touch notifications for gearVR and GO

src/Gamepads/Controllers/gearVRController.ts

@@ -29,7 +29,7 @@ export class GearVRController extends WebVRController {
     public static readonly GAMEPAD_ID_PREFIX: string = 'Gear VR'; // id is 'Gear VR Controller'
 
     private readonly _buttonIndexToObservableNameMap = [
-        'onTrackpadChangedObservable', // Trackpad
+        'onPadStateChangedObservable', // Pad
         'onTriggerStateChangedObservable' // Trigger
     ];
 
@@ -73,7 +73,7 @@ export class GearVRController extends WebVRController {
     protected _handleButtonChange(buttonIdx: number, state: ExtendedGamepadButton, changes: GamepadButtonChanges) {
         if (buttonIdx < this._buttonIndexToObservableNameMap.length) {
             const observableName: string = this._buttonIndexToObservableNameMap[buttonIdx];
-
+            
             // Only emit events for buttons that we know how to map from index to observable
             let observable = (<any>this)[observableName];
             if (observable) {